According to Darwin, evolution occurs due to the reason of natural selection. Because of the characteristics of species are changing from time to time. The characteristics of organisms are also changing frequently. Darwin thought that the color of species is changing day by day. Apart from the darwin thought, practically the body and color of the persons were changing from time to time. So it is due to natural selection. Therefore due to species evolution is changing naturally. So the answer is d.
Answer from: Quest
characterization of nanoparticles is a critical step in nanomaterial production as it provides information of dimension, morphology, surface charge, distribution and degree of surface functionalization.
Answer from: Quest
The right answer is b hydrogen bonds!
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